The "clicked" function could be triggered multiple times in certain circumstance, on which I haven't research further yet.
But one solution to this is to remove the binded event before binding/live it, sth like:
$(".click").die("click").live("click",clicked);

I re-installed my system with Debian Wheezy the other day. And then downloaded and installed the official Nvidia graphic driver for my GeForce G105M card. The driver version is 285.05.09 Certified published on 2011.10.05.
But unfortunately, the system became quite slow with many applications like nautilus, chrome, firefox etc. The symptoms were:
1. It's very slow to open new tab in chrome/nautilus, or to switch between tabs. It could takes several seconds!